Hello,
Just bought a used Tamron 24-70mm 2.8 G1, Nikon F mount. Under a microscope, there's black border around the particle but there's also opaque whitish area outside and next to the black border. Can you tell me if this is fugus? This 'spot' is inside the lens, between the front of the lens and the blades so it can't be cleaned unless the lens is disassembled. If it's fungus, I can return it. Thank you.
Here are the images: